1. Any water or waste which may contain more than one hundred (100) parts per million, by weight, of fat, oil or grease;

2. Any gasoline, benzene, naphtha, fuel oil or other flammable or explosive liquid, solid or gas;

3. Any garbage that has not been properly shredded;

4. Any ashes, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, paunch, manure or any other solid or viscous substance capable of causing obstruction to the flow in sewers or other interference with the proper operation of the sewage works;

5. Any water or wastes having pH lower than five and five-tenths or higher than eight and five-tenths or having any other corrosive property capable of causing damage or hazard to structures, equipment and personnel of the sewage works;

6. Any waters or wastes containing a toxic or poisonous, substance, hazardous regulated substances which are prohibited by federal, state or city statute, rule or ordinance from being discharged into sewer systems of the type operated by the city;

7. Any waters or wastes containing suspended solids of such character and quantity that unusual attention or expenses is required to handle such materials at the sewage treatment plant;

8. Any noxious or malodorous gas or substance capable of creating a public nuisance.